<template>
  <!-- 登录页面的整体盒子 -->
  <div class="login-container">
    <!-- 登录的盒子 -->
    <div class="login-box">
      <!-- 标题的盒子 -->
      <div class="title-box"></div>
      <!-- 登录的表单区域 -->
      <el-form :model="loginForm" :rules="loginRules" ref="loginRef">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input
            v-model="loginForm.username"
            placeholder="请输入用户名"
            prefix-icon="el-icon-user"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            v-model="loginForm.password"
            type="password"
            placeholder="请输入密码"
            prefix-icon="el-icon-lock"
          >
          </el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item>
          <el-button type="primary" class="login-btn" @click="login"
            >登录</el-button
          >
          <el-link type="info" @click="$router.push('/reg')">去注册</el-link>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: "Login",
  data() {
    return {
      // 表单数据对象
      loginForm: {
        username: "",
        password: ""
      },
      // 表单验证规则对象
      // TODO
      loginRules: {
        username: [
          { required: true, message: "请输入用户名", trigger: "blur" },
          {
            pattern: /^[a-zA-Z0-9]{1,10}$/,
            message: "用户名必须是1-10位的字母数字",
            trigger: "blur"
          }
        ],
        password: [
          { required: true, message: "请输入密码", trigger: "blur" },
          {
            pattern: /^\S{6,15}$/,
            message: "密码必须是6-15位的非空字符",
            trigger: "blur"
          }
        ]
      }
    }
  },
  methods: {
    // 登录按钮功能
    login() {
      this.$refs.loginRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          "/api/login",
          this.loginForm
        )
        if (res.code === 0) {
          // 登陆成功
          // 登陆成功信息提示
          this.$message.success(res.message)
          // 存储token到本地
          localStorage.setItem("token", res.token)
          // 跳转页面
          this.$router.push("/")
        } else {
          // 登录失败
          // 登录失败信息提示
          this.$message.error(res.message)
        }
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login-container {
  background: url("../../assets/images/login_bg.jpg") center;
  background-size: cover;
  height: 100%;

  .login-box {
    width: 400px;
    height: 270px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    padding: 0 20px;
    box-sizing: border-box;

    .title-box {
      height: 60px;
      background: url("../../assets/images/login_title.png") center no-repeat;
    }

    .login-btn {
      width: 100%;
    }
  }
}
</style>
